Laminariocolax aecidioides (Phaeophyceae) epi-endophytic in Undaria pinnatifida (Phaeophyceae) in patagonian coasts .

GAUNA, M. C.; PIZANI, N. V.; PARODI, E. R.

Viena, Austria

Congreso; XVII International Botanical Congress; 2005

Society for the Advancement of Plant Sciences, University of Vienna, Austrian Federal Ministry for Education, Science and Culture y Austrian Federal Ministry for Agriculture, Forestry, Environment and Water Management.

Laminariocolax aecidioides has been considered like an epi-endophytic organism of the kelps of the North Pacific, Artic and European coasts, extending its distribution to the South hemisphere. The thalli of U. pinnaatifida infected by this species were collected in the intertidal zone of the patagonian coasts of Argentina. On cuticle of the kelp the infection developed as dark spots of 1-2 mm that covered partially fronds and sporophyles. In the cortical and medullar zones of U. pinnatifida, the infectants cells occupied the intercellular spaces without penetrating in the host cells. The thallus formed a postrate layer of filaments on the surface of the host. The reproductive structures were formed on the srface of the host. The uniloculars sporangia were uniseriate, ovoid and exhibited or apical dehiscence, and the pluriloculars were extended. The invasion was neither associate to ruptures or perforations in the tahlli of keps, although it was well-known a redominance of the tahlli of L. aecidioides related to the openings of the glands of mucilage and depressions of the epidermic layer of the host.